It really does all depend on what you want in terms of the environment or the amenities. I have lived in a tourist area - Juan Dolio, close to the capital and on the ocean. That had the restaurants, proximity to an airport and SD, good supermarkets and plenty of nightlife (in those days). However crime was high. We then moved to a barrio in a small town in the north west, around 20 minutes from a reasonable supermarket. Very friendly neighbours but no restaurants, only colmados, very dirty, very dusty and very cheap - rent for a 3 bedroomed nice house was RD$7,000 a month. Now we live at around 1500 feet in the north west mountains in the campo and I wouldn't want to live anywhere else. Much cooler, lower humidity, crime free but no supermarket, no restaurants and no entertainment. I personally would not like to live where there are too many expats but you do have to be able to speak Spanish if you go off the beaten track.
Matilda